Q: 7
Exhibit
S Exhibit
LSI1 A AS 65501
ISPB AS 65502
Advertised Prefixes: 172.20.0.0/24 172.20.20.0/24 172.20.21.0/24
\ N
Advertised Prefixes: 172.20.0.0/24
172.20.1.0/24
Referring to the exhibit, which two statements are correct? (Choose two.)
Referring to the exhibit, which two statements are correct? (Choose two.)Options
Discussion
These Juniper questions always twist BGP basics. It's A and B.
Yep, both A and B fit the BGP local preference logic here.
A/B here. ISP B not advertising 172.20.21.0/24 is the trap, so only ISP A can be used for that prefix. Disagree?
Small catch here, it's A and B since ISP B isn't even advertising 172.20.21.0/24 so that flips the logic.
Its A and B, but only because ISP B doesn’t announce 172.20.21.0/24 so default tie-breakers don’t even apply there.
Option A and Option D. Not totally sure since the prefixes overlap a bit, but I think AS 65512 will use ISP A for traffic to 172.20.21.0/24 (since only A advertises it), and ISP B for 172.20.0.0/24 because of higher local pref.
Be respectful. No spam.
